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The Greater Yellowstone Network (GRYN) was established by the National Park Service Inventory and Monitoring Program in 2000 to help enhance the scientific basis for stewardship and management of natural resources in Bighorn Canyon National Recreation Area, Grand Teton National Park (including John D. Rockefeller, Jr. Memorial Parkway), and Yellowstone National Park. A map of the parks and links to park web sites are available from the navigation bar on the right.

The Greater Yellowstone Network is one of 32 units nation-wide that group some 270 national parks into networks based on geographic similarities, common natural resources, and resource protection challenges. This collective approach to inventory and monitoring helps to facilitate collaboration and information sharing between the parks and with other natural resource management agencies and interests.